The hex color #28727c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#D78D83. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#5BA5AF, and Hex
#003F49 is the 20% darker color. If the color is saturated by 10%, you get
#23747F. If the color is desaturated by 10%, the color
#2D7079 is obtained.